Viscosity and Thermal Conductivity Models of 151 Common Fluids Based on Residual Entropy Scaling and Cubic Equations of State

A residual entropy
scaling (RES) approach combined with the cubic
equation of state (EoS) was developed to calculate the viscosity and
thermal conductivity of 151 common fluids. These pure fluids are all
the pure fluids available in the NIST’s REFPROP 10.0 database.
Seven cubic EoS were studied, while only four yielded good and similar
results; these are Peng–Robinson (PR), Soave–Redlich–Kwong
(SRK), Patel–Teja–Valderrama (PTV), and Yang–Frotscher–Richter
(YFR) EoS. The parameters of a pure fluid in this cubic EoS + RES
approach were fitted using experimental data if they are available
in the NIST ThermoData Engine database 10.1, otherwise, using the
calculations of REFPROP 10.0. This approach is applicable in the entire
temperature and pressure ranges for thermal conductivity and at pressures
lower than 60 MPa for viscosity. Using this approach, the average
absolute value of the relative deviation (AARD) of all of the analyzable
experimental values from model calculations was approximately 3.1%
and 3.6% for viscosity and thermal conductivity, respectively. This
result is not too bad compared to 2.7% and 2.5% obtained by the state-of-the-art
viscosity and thermal conductivity models in REFPROP 10.0. The key
advantage of this approach is that it has a much simpler equation
form and can be easily extended to more fluids. The developed approach
has been implemented in the OilMixProp 1.0 software package, and this
work will be a basis for the future development of more than 600 pure
fluids.